Abu Dhabi-based airline Etihad has quietly acquired 2.987 per cent of Aer Lingus’s shares over the past couple of months.

Aer Lingus last night confirmed it was in discussions with Etihad in relation to reciprocal code-sharing arrangements. The two airlines are also investigating the possibility of joint procurement opportunities.

Aer Lingus said Etihad had given an undertaking it does not intend to increase its shareholding pending the outcome of these discussions. Aer Lingus said: “There is no certainty as to the outcome of these discussions.”